Locking Differential versus Limited Slip differential

[j cAT]

Originally Posted by Elbert

dobut the GM version is a true locker...more likely an aggressive limited slip.

go to the eaton diff web site. If you doubt that it is not a locking diff..no secret what it is..since I do own both the limited and locking for me ,, it is no doubt as to what it does ,,, and why ,,,,and how...


eaton web site has good info about all this..

[Brandon Archer]

hey guess, i have a 2000 chevy tohoe Z71 and it has the G86 limited slip, is it a strong limited slip or does it let one tire spin to much?

[j cAT]

Originally Posted by Brandon Archer

hey guess, i have a 2000 chevy tohoe Z71 and it has the G86 limited slip, is it a strong limited slip or does it let one tire spin to much?

G86 is used in AWD quad steer vehicles.

all 4wd vehicles have the g80 ..just look in your glove box for code or call dealership with the vin #.......

the reason you must know what diff you have FOR SURE is , with the G86 you need the 4oz of additive for the cluches.use of 80-90wt GL5 gear oil is the fluid to use with this one.

adding this 4oz of friction modifier to a G80 you will damage it. 75-90wt synthetic is used only with the G80.

[Brandon Archer]

it has G86 in the glov box, and when i go in a turn and spin the will it starts to spin but it churps, like its sliping then grabing

[slo99sierra]

Searched for the G86 diff.
http://www.fullsizechevy.com/forum/g...74482-g86.html
http://www.drivetrain.com/parts_cata...chevrolet.html
http://www.fullsizechevy.com/forum/g...ue-locker.html
http://chevytruckworld.tenmagazines....d=185193&pos=2

To sum it up...The G86 is a "Limited Slip" which was offered on vehicles ranging from at least 1999 to 2002, in 2003 they became standard. From what I've read it doesn't really work like a true limited slip.

The G80 is both a locker and limited slip.

[j cAT]

Originally Posted by Brandon Archer

it has G86 in the glov box, and when i go in a turn and spin the will it starts to spin but it churps, like its sliping then grabing

that is what a g86 would do with your discription of operation . since I have this in the 96 impala. the diff is always locked in a limited amount of friction. this is where , the friction modifier additive comes in to control this friction locking value. too much lock it will be bad for the diff clutches.also this diff requires more frequent fluid changes.

to test the diff use a torque wrench set to 50 ft lbs lift one rear wheel the torque wrench on the wheel stud/nut . torque required to spin wheel is around the 50 ft lbs if working as oem spec...

[manshooter]

We order almost 100% of our pickups with the G80 option these days, as everyone that knows what it is seems to want it. I had it in my 2009 2WD 1500 LT Ext Cab, and I have it in my new 2011 4X4 1500 Ext Cab LTZ as well.
It is quite simple really. Once one side rotates 2 turns with the other side stable, the G80 locks them up. Once you reach 20 MPH the G80 lets go. It will not operate at speeds over 20 mph, so if your going into a turn faster than that and one wheel breaks loose, the G80 locker still will not engage.
I was totally happy with my 2WD truck, and I would have bought another one, but we did not have a 2WD LTZ in stock and the deal they offered me to hit their bonus level for the dealership for the final quarter was just to good to pass up and I didn't have time to do a locate on it and get it delivered to myself before the end of the month.
I believe IMHO that MOST truck users in THIS area would be totally happy with a 2 WD truck with a G80 in it. I sell approx 35% 2 WD's now that the G80 is installed in most of them and now that the people know what they are. Of all the ones I have sold, I have had only 2 people come back unhappy and want to trade it in on a 4X4. But then the same guy came back and was unhappy with that one too, and traded it in on a 2500. (I am sure he was not happy with it either, but I just didn't care anymore. You cant please everyone.) The other one bought some hunting land in the hilly area south of here and said he needed it to get in and out of his hunting cabin.
I would never buy a 2WD OR a 4WD without the G80 in it. And I would have a really hard time selling one to anyone else as well. I KNOW how well they work, and I highly recommend them to anyone buying a GM product that has it available on it.
Again, this is just MY opinion, and everyone has one.
But..as for them blowing up, or what ever? I asked my top techs in the shop (As they are the ones that would be working on them if they did come in.) and they seem to be unaware of any problems with this option. I know for a fact my customers have not had any problems with theirs, (so maybe we have just been lucky with them here...?) The techs claim to have some tranny problems when people have abused them, and some that were just defective, but no real trouble with the G80 rear ends.
Good luck to those that buy them. I hope you enjoy yours as much as I have mine.

[j cAT]

the g80 diff reqiures a breakin period. also the diff fluid must be replaced at the first engine oil change.

this is all explained in the GM top secret TSB. the eaton web site also gets into all of this in great detail. the gear teeth are in need of a gradual heat process when first operated. if this metal gets to hot the gear teeth crack, then the diff blows up.

[Brandon Archer]

well i was on a hill with my s10 and it locked but the tire off the ground started spining still but the one that has all the waight on it was still pulling but not spinning then i got into the gas a little harder then let off then got back in it and then i heard a zing sound and now it wont lock up at all...is there such thing as a G80 locking Limited slip? because thats what i have idk what the hell reason they made two seriese lol but i need to find the part to fix it, it still acks like a mild limited slip all the time tho, but not what i want

[j cAT]

Originally Posted by Brandon Archer

well i was on a hill with my s10 and it locked but the tire off the ground started spining still but the one that has all the waight on it was still pulling but not spinning then i got into the gas a little harder then let off then got back in it and then i heard a zing sound and now it wont lock up at all...is there such thing as a G80 locking Limited slip? because thats what i have idk what the hell reason they made two seriese lol but i need to find the part to fix it, it still acks like a mild limited slip all the time tho, but not what i want

this is how the G86 works .it is on all the time. when one wheel is on solid pavement the other wheel will spin ON THE ICE , and your stuck..[WHEN GOING UP HILL].....

[Brandon Archer]

i know that...im saying i put my truck on a jack and left one tire on the ground and the other in the air and let off the break and it spun then it slowed down and the other tire churpt and i was moving forward. on a hill with a ton of waight on one tire the other will spin then lock then slip alot, but it still is grabbing and moveing just not as fast as the tire in the air

[j cAT]

Originally Posted by Brandon Archer

i know that...im saying i put my truck on a jack and left one tire on the ground and the other in the air and let off the break and it spun then it slowed down and the other tire churpt and i was moving forward. on a hill with a ton of waight on one tire the other will spin then lock then slip alot, but it still is grabbing and moveing just not as fast as the tire in the air

with your diff as you stated was/is a G86 . with one rear wheel on the ground, the other wheel off the ground ,you set the torque wrench to 50 ftlbs. then you on a lug stud/nut try to rotate this wheel off the ground. at 50 ft lbs this should begin to rotate..if too little torque is required then your diff is broken.

[Brandon Archer]

yeah but what i dont get is in my glove box it has G80, i just have never heard of a locking limited slip, i know fords run on cluches and its activated all day but dad told me that i might have had somthing twisted in the diff and that it imitated limited slip when it locked but then when i got on the gas it finished it off

[j cAT]

Originally Posted by Brandon Archer

yeah but what i dont get is in my glove box it has G80, i just have never heard of a locking limited slip, i know fords run on cluches and its activated all day but dad told me that i might have had somthing twisted in the diff and that it imitated limited slip when it locked but then when i got on the gas it finished it off

Brandon you stated the glove box stated G86 earlier post . now its stating G80.

do you need eye glasses or are you just a confused person ?

[troy1]

This will explain it for you

http://www.youtube.com/watch?v=KbMZ9vcYVSg